When is it appropriate to use a vent pipe or stack?

Using a vent pipe or stack is appropriate when venting compressed natural gas (CNG) to the atmosphere. This practice is crucial for safely releasing gas without creating hazardous conditions. A properly designed venting system ensures that any escaped gas is directed away from potential ignition sources and helps mitigate risks associated with gas accumulation in confined spaces.

Venting is an important safety measure, as it prevents the buildup of gas which could lead to explosions or fires. It is vital to follow regulatory requirements and industry standards when implementing venting systems to ensure they effectively manage gas discharge in a safe manner.

In contrast, venting practices are not generally employed during refueling, checking for leaks, or performing maintenance, as these activities focus more on containment and safety procedures rather than gas release. Each of those activities has specific safety protocols that are designed to handle CNG without the need to vent it directly to the atmosphere, ensuring both worker safety and environmental protection.